Question:
Identify the IUPAC name for the coordination compound \( [Co(NH_3)_6]Cl_3 \).
Identify the IUPAC name for the coordination compound \( [Co(NH_3)_6]Cl_3 \).
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In coordination compounds:
- \(NH_3\) ligand is named ammine.
- Neutral ligands do not affect oxidation state calculations.
- The oxidation state of the metal balances the charge of the complex ion.
Updated On: May 1, 2026
- Hexaamminecobalt(II) chloride
- Hexaamminecobalt(III) chloride
- Hexamminecobalt(III) chloride
- Hexaamminecobalt(II) trichloride
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The Correct Option is B
Solution and Explanation
Concept:
In coordination compounds:
• Neutral ligands like \(NH_3\) are named as ammine.
• The number of ligands is indicated using prefixes such as di, tri, tetra, hexa, etc.
• The oxidation state of the metal is written in Roman numerals in parentheses.
Step 1: Identify the ligand and its number. The ligand is \(NH_3\) (ammine). There are six such ligands. \[ \text{Hexaammine} \]
Step 2: Determine the oxidation state of cobalt. The complex ion is: \[ [Co(NH_3)_6]^{3+} \] Since \(NH_3\) is a neutral ligand and three \(Cl^-\) ions are outside the coordination sphere, cobalt must have oxidation state: \[ +3 \]
Step 3: Write the complete IUPAC name. Combining ligand name, metal name, and oxidation state: \[ \text{Hexaamminecobalt(III) chloride} \]
• Neutral ligands like \(NH_3\) are named as ammine.
• The number of ligands is indicated using prefixes such as di, tri, tetra, hexa, etc.
• The oxidation state of the metal is written in Roman numerals in parentheses.
Step 1: Identify the ligand and its number. The ligand is \(NH_3\) (ammine). There are six such ligands. \[ \text{Hexaammine} \]
Step 2: Determine the oxidation state of cobalt. The complex ion is: \[ [Co(NH_3)_6]^{3+} \] Since \(NH_3\) is a neutral ligand and three \(Cl^-\) ions are outside the coordination sphere, cobalt must have oxidation state: \[ +3 \]
Step 3: Write the complete IUPAC name. Combining ligand name, metal name, and oxidation state: \[ \text{Hexaamminecobalt(III) chloride} \]
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